diff --git a/.github/workflows/backend.yml b/.github/workflows/backend.yml
index 706f824..26a0455 100644
--- a/.github/workflows/backend.yml
+++ b/.github/workflows/backend.yml
@@ -19,7 +19,7 @@ jobs:
     runs-on: ubuntu-16.04
     strategy:
       matrix:
-        lws-version: [4.0.19, 3.2.3, 2.4.2]
+        lws-version: [4.0.20, 3.2.3, 2.4.2]
     steps:
       - name: Install packages
         run: |
diff --git a/scripts/cross-build.sh b/scripts/cross-build.sh
index 3be7201..7c3af9a 100755
--- a/scripts/cross-build.sh
+++ b/scripts/cross-build.sh
@@ -115,7 +115,7 @@ build() {
     echo "=== Installing toolchain ${ALIAS} (${TARGET})..."
 
     mkdir -p "${CROSS_ROOT}" && export PATH="${PATH}:/opt/cross/bin"
-    curl -sLo- "http://musl.cc/${TARGET}-cross.tgz" | tar xz -C ${CROSS_ROOT} --strip-components 1
+    curl -sLo- "http://musl.cc/${TARGET}-cross.tgz" | tar xz -C "${CROSS_ROOT}" --strip-components 1
 
     echo "=== Building target ${ALIAS} (${TARGET})..."